/*******************************************************************************
 * Copyright 2010 Simon Mieth
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package cn.kkdlk.parse.dxf.parser.filter;

import cn.kkdlk.parse.dxf.parser.DXFValue;
import cn.kkdlk.parse.parser.ParseException;


abstract class DXFStreamEntityFilter extends DXFStreamSectionFilter {
    public static final int ENTITY_START = 0;
    private static final String SECTION_KEY = "ENTITIES";
    protected boolean entitySection = false;
    protected boolean parseEntity = false;
    protected boolean parseHeader = false;

    protected void parseSection(int groupCode, DXFValue value)
            throws ParseException {
        if (parseHeader) {
            if (value.getValue().equals(SECTION_KEY)) {
                this.entitySection = true;
                this.parseHeader = false;
            }
        } else if (entitySection) {
            if (groupCode == ENTITY_START) {
                if (parseEntity) {
                    endEntity();
                } else {
                    parseEntity = true;
                }

                startEntity(value.getValue());
            }

            parseEntity(groupCode, value);

            return;
        }

        handler.parseGroup(groupCode, value);
    }

    protected void sectionEnd(String Section) throws ParseException {
        if (section.equals(SECTION_KEY)) {
            this.entitySection = false;
        }
    }

    protected void sectionStart(String Section) throws ParseException {
        if (section.equals(SECTION_KEY)) {
            this.parseHeader = true;
        }
    }

    protected abstract void startEntity(String type) throws ParseException;

    protected abstract void endEntity() throws ParseException;

    protected abstract void parseEntity(int groupCode, DXFValue value)
            throws ParseException;
}
